MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Polymer Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which curve represents the gel formation in the following graph, for a trifunctional polycondensation |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 2. |
The Carothers’ equation is used to predict the extent of polycondensation reaction at which the average degree of polymerization Xn, becomes infinite. State true or false. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
Why is it advisable to stop the reaction nearly 10-15% earlier the critical reaction completion? |
| A. | cross-linking occurs |
| B. | to avoid damage of reaction bowl |
| C. | insoluble, bad quality product is obtained |
| D. | all of the mentioned |
| Answer» E. | |
| 4. |
The Carothers’ equation is used to predict the extent of polycondensation reaction at which the average degree of polymerization Xn, becomes infinite. State true or false.$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
Which of the following assumptions fail taking into account the example of glycerol? |
| A. | equal reactivity of functional groups |
| B. | intramolecular cyclization reactions are forbidden |
| C. | all of the mentioned |
| D. | none of the mentioned |
| Answer» B. intramolecular cyclization reactions are forbidden | |
| 6. |
What is the critical value of probability for trifunctional branch unit? |
| A. | 1 |
| B. | 0.5 |
| C. | 0.25 |
| D. | 0.7 |
| Answer» C. 0.25 | |
| 7. |
What does f in the expression for critical probability that the branched unit is linked to another branched unit, represents? |
| A. | average functionality |
| B. | functionality of branched units |
| C. | functionality of monomer |
| D. | none of the mentioned |
| Answer» C. functionality of monomer | |
| 8. |
The cross linking established by linking the branched units leads to three dimensional structure which gives rise to the phenomenon of gelation of reaction mixture. State true or false. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 9. |
How does the viscosity vary with the onset of gelation of reaction mixture? |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | none of the mentioned |
| Answer» B. decreases | |